Methods and apparatus for multi-coreset pdcch aggregation

ABSTRACT

A method of wireless communication may include a UE and a base station. The base station may configure, for the UE, a search space associated with a first CORESET and a second CORESET, and transmit a PDCCH within the configured search space. The UE may monitor for the PDCCH based on the configuration of the search space, where at least one PDCCH candidate may include components associated with different CORESETs on different monitoring occasions. The PDCCH candidate may include a first subset within the first CORESET and a second subset within the second CORESET. The PDCCH candidate may include a third subset including a first and second components, and at least one of the first and second components may be itself a PDCCH candidate within the first or second subset of the PDCCH candidates.

CROSS REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit of and priority to U.S. ProvisionalApplication Ser. No. 63/055,805, entitled “METHOD AND APPARATUS FORMULTI-CORESET PDCCH AGGREGATION” and filed on Jul. 23, 2020, which isexpressly incorporated by reference herein in its entirety.

TECHNICAL FIELD

The present disclosure relates generally to communication systems, andmore particularly, to a method and apparatus for using multiple controlresource set (CORESET) physical downlink control channel (PDCCH)aggregation to improve the coverage of the PDCCH.

INTRODUCTION

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources. Examples of suchmultiple-access technologies include code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example telecommunication standardis 5G New Radio (NR). 5G NR is part of a continuous mobile broadbandevolution promulgated by Third Generation Partnership Project (3GPP) tomeet new requirements associated with latency, reliability, security,scalability (e.g., with Internet of Things (IoT)), and otherrequirements. 5G NR includes services associated with enhanced mobilebroadband (eMBB), massive machine type communications (mMTC), andultra-reliable low latency communications (URLLC). Some aspects of 5G NRmay be based on the 4G Long Term Evolution (LTE) standard. There existsa need for further improvements in 5G NR technology. These improvementsmay also be applicable to other multi-access technologies and thetelecommunication standards that employ these technologies.

BRIEF SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all

contemplated aspects, and is intended to neither identify key orcritical elements of all aspects nor delineate the scope of any or allaspects. Its sole purpose is to present some concepts of one or moreaspects in a simplified form as a prelude to the more detaileddescription that is presented later.

In an aspect of the disclosure, a method, a computer-readable medium,and an apparatus are provided. The apparatus of wireless communicationmay include a UE and/or a base station. The base station may transmit asearch space configuration for a search space to the UE, the searchspace configuration configuring the search space to be associated with afirst CORESET and a second CORESET, and transmit a PDCCH within theconfigured search space. The UE may receive the search spaceconfiguration for the search space. The UE may also monitor for thePDCCH based on the search space configuration received from the basestation. In one aspect, at least one PDCCH candidate may includecomponents associated with different CORESETs on different monitoringoccasions. The PDCCH candidate may include a first subset within thefirst CORESET and a second subset within the second CORESET. The firstor second component may be itself a PDCCH candidate within the first orsecond subset of the PDCCH candidates. The PDCCH candidates may have anaggregation level greater than a threshold value, which may beconfigured explicitly through one of a downlink control information(DCI) or a medium access control (MAC) control element (CE) (MAC-CE), orimplicitly based on another dynamic signaling.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network.

FIG. 2A is a diagram illustrating an example of a first frame, inaccordance with various aspects of the present disclosure.

FIG. 2B is a diagram illustrating an example of DL channels within asubframe, in accordance with various aspects of the present disclosure.

FIG. 2C is a diagram illustrating an example of a second frame, inaccordance with various aspects of the present disclosure.

FIG. 2D is a diagram illustrating an example of UL channels within asubframe, in accordance with various aspects of the present disclosure.

FIG. 3 is a diagram illustrating an example of a base station and userequipment (UE) in an access network.

FIG. 4 illustrates an example of a search space associated with multipleCORESETs.

FIG. 5 is a call-flow chart of a method of wireless communication.

FIG. 6 is a flowchart of a method of wireless communication.

FIG. 7 is a flowchart of a method of wireless communication.

FIG. 8 is a flowchart of a method of wireless communication.

FIG. 9 is a flowchart of a method of wireless communication.

FIG. 10 is a diagram illustrating an example of a hardwareimplementation for an example apparatus.

FIG. 11 is a diagram illustrating an example of a hardwareimplementation for an example apparatus.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known structures and components areshown in block diagram form in order to avoid obscuring such concepts.

Several aspects of telecommunication systems will now be presented withreference to various apparatus and methods. These apparatus and methodswill be described in the following detailed description and illustratedin the accompanying drawings by various blocks, components, circuits,processes, algorithms, etc. (collectively referred to as “elements”).These elements may be implemented using electronic hardware, computersoftware, or any combination thereof. Whether such elements areimplemented as hardware or software depends upon the particularapplication and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or anycombination of elements may be implemented as a “processing system” thatincludes one or more processors. Examples of processors includemicroprocessors, microcontrollers, graphics processing units (GPUs),central processing units (CPUs), application processors, digital signalprocessors (DSPs), reduced instruction set computing (RISC) processors,systems on a chip (SoC), baseband processors, field programmable gatearrays (FPGAs), programmable logic devices (PLDs), state machines, gatedlogic, discrete hardware circuits, and other suitable hardwareconfigured to perform the various functionality described throughoutthis disclosure. One or more processors in the processing system mayexecute software. Software shall be construed broadly to meaninstructions, instruction sets, code, code segments, program code,programs, subprograms, software components, applications, softwareapplications, software packages, routines, subroutines, objects,executables, threads of execution, procedures, functions, etc., whetherreferred to as software, firmware, middleware, microcode, hardwaredescription language, or otherwise.

Accordingly, in one or more example embodiments, the functions describedmay be implemented in hardware, software, or any combination thereof. Ifimplemented in software, the functions may be stored on or encoded asone or more instructions or code on a computer-readable medium.Computer-readable media includes computer storage media. Storage mediamay be any available media that can be accessed by a computer. By way ofexample, and not limitation, such computer-readable media can comprise arandom-access memory (RAM), a read-only memory (ROM), an electricallyerasable programmable ROM (EEPROM), optical disk storage, magnetic diskstorage, other magnetic storage devices, combinations of the types ofcomputer-readable media, or any other medium that can be used to storecomputer executable code in the form of instructions or data structuresthat can be accessed by a computer.

While aspects and implementations are described in this application byillustration to some examples, those skilled in the art will understandthat additional implementations and use cases may come about in manydifferent arrangements and scenarios. Innovations described herein maybe implemented across many differing platform types, devices, systems,shapes, sizes, and packaging arrangements. For example, implementationsand/or uses may come about via integrated chip implementations and othernon-module-component based devices (e.g., end-user devices, vehicles,communication devices, computing devices, industrial equipment,retail/purchasing devices, medical devices, artificial intelligence(AI)-enabled devices, etc.). While some examples may or may not bespecifically directed to use cases or applications, a wide assortment ofapplicability of described innovations may occur. Implementations mayrange a spectrum from chip-level or modular components to non-modular,non-chip-level implementations and further to aggregate, distributed, ororiginal equipment manufacturer (OEM) devices or systems incorporatingone or more aspects of the described innovations. In some practicalsettings, devices incorporating described aspects and features may alsoinclude additional components and features for implementation andpractice of claimed and described aspect. For example, transmission andreception of wireless signals necessarily includes a number ofcomponents for analog and digital purposes (e.g., hardware componentsincluding antenna, RF-chains, power amplifiers, modulators, buffer,processor(s), interleaver, adders/summers, etc.). It is intended thatinnovations described herein may be practiced in a wide variety ofdevices, chip-level components, systems, distributed arrangements,aggregated or disaggregated components, end-user devices, etc. ofvarying sizes, shapes, and constitution.

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network 100. The wireless communications system(also referred to as a wireless wide area network (WWAN)) includes basestations 102, UEs 104, an Evolved Packet Core (EPC) 160, and anothercore network 190 (e.g., a 5G Core (5GC)). The base stations 102 mayinclude macrocells (high power cellular base station) and/or small cells(low power cellular base station). The macrocells include base stations.The small cells include femtocells, picocells, and microcells.

The base stations 102 configured for 4G LTE (collectively referred to asEvolved Universal Mobile Telecommunications System (UMTS) TerrestrialRadio Access Network (E-UTRAN)) may interface with the EPC 160 throughfirst backhaul links 132 (e.g., 51 interface). The base stations 102configured for 5G NR (collectively referred to as Next Generation RAN(NG-RAN)) may interface with core network 190 through second backhaullinks 184. In addition to other functions, the base stations 102 mayperform one or more of the following functions: transfer of user data,radio channel ciphering and deciphering, integrity protection, headercompression, mobility control functions (e.g., handover, dualconnectivity), inter-cell interference coordination, connection setupand release, load balancing, distribution for non-access stratum (NAS)messages, NAS node selection, synchronization, radio access network(RAN) sharing, multimedia broadcast multicast service (MBMS), subscriberand equipment trace, RAN information management (RIM), paging,positioning, and delivery of warning messages. The base stations 102 maycommunicate directly or indirectly (e.g., through the EPC 160 or corenetwork 190) with each other over third backhaul links 134 (e.g., X2interface). The first backhaul links 132, the second backhaul links 184,and the third backhaul links 134 may be wired or wireless.

The base stations 102 may wirelessly communicate with the UEs 104. Eachof the base stations 102 may provide communication coverage for arespective geographic coverage area 110. There may be overlappinggeographic coverage areas 110. For example, the small cell 102′ may havea coverage area 110′ that overlaps the coverage area 110 of one or moremacro base stations 102. A network that includes both small cell andmacrocells may be known as a heterogeneous network. A heterogeneousnetwork may also include Home Evolved Node Bs (eNBs) (HeNBs), which mayprovide service to a restricted group known as a closed subscriber group(CSG). The communication links 120 between the base stations 102 and theUEs 104 may include uplink (UL) (also referred to as reverse link)transmissions from a UE 104 to a base station 102 and/or downlink (DL)(also referred to as forward link) transmissions from a base station 102to a UE 104. The communication links 120 may use multiple-input andmultiple-output (MIMO) antenna technology, including spatialmultiplexing, beamforming, and/or transmit diversity. The communicationlinks may be through one or more carriers. The base stations 102/UEs 104may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz)bandwidth per carrier allocated in a carrier aggregation of up to atotal of Yx MHz (x component carriers) used for transmission in eachdirection. The carriers may or may not be adjacent to each other.Allocation of carriers may be asymmetric with respect to DL and UL(e.g., more or fewer carriers may be allocated for DL than for UL). Thecomponent carriers may include a primary component carrier and one ormore secondary component carriers. A primary component carrier may bereferred to as a primary cell (PCell) and a secondary component carriermay be referred to as a secondary cell (SCell).

Certain UEs 104 may communicate with each other using device-to-device(D2D) communication link 158. The D2D communication link 158 may use theDL/UL WWAN spectrum. The D2D communication link 158 may use one or moresidelink channels, such as a physical sidelink broadcast channel(PSBCH), a physical sidelink discovery channel (PSDCH), a physicalsidelink shared channel (PSSCH), and a physical sidelink control channel(PSCCH). D2D communication may be through a variety of wireless D2Dcommunications systems, such as for example, WiMedia, Bluetooth, ZigBee,Wi-Fi based on the Institute of Electrical and Electronic s Engineers(IEEE) 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154, e.g., in a 5 GHz unlicensed frequency spectrumor the like. When communicating in an unlicensed frequency spectrum, theSTAs 152/AP 150 may perform a clear channel assessment (CCA) prior tocommunicating in order to determine whether the channel is available.

The small cell 102′ may operate in a licensed and/or an unlicensedfrequency spectrum. When operating in an unlicensed frequency spectrum,the small cell 102′ may employ NR and use the same unlicensed frequencyspectrum (e.g., 5 GHz, or the like) as used by the Wi-Fi AP 150. Thesmall cell 102′, employing NR in an unlicensed frequency spectrum, mayboost coverage to and/or increase capacity of the access network.

The electromagnetic spectrum is often subdivided, based onfrequency/wavelength, into various classes, bands, channels, etc. In 5GNR, two initial operating bands have been identified as frequency rangedesignations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz).Although a portion of FR1 is greater than 6 GHz, FR1 is often referredto (interchangeably) as a “sub-6 GHz” band in various documents andarticles. A similar nomenclature issue sometimes occurs with regard toFR2, which is often referred to (interchangeably) as a “millimeter wave”band in documents and articles, despite being different from theextremely high frequency (EHF) band (30 GHz-300 GHz) which is identifiedby the International Telecommunications Union (ITU) as a “millimeterwave” band.

The frequencies between FR1 and FR2 are often referred to as mid-bandfrequencies. Recent 5G NR studies have identified an operating band forthese mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25 GHz). Frequency bands falling within FR3 may inherit FR1characteristics and/or FR2 characteristics, and thus may effectivelyextend features of FR1 and/or FR2 into mid-band frequencies. Inaddition, higher frequency bands are currently being explored to extend5G NR operation beyond 52.6 GHz. For example, three higher operatingbands have been identified as frequency range designations FR4a or FR4-1(52.6 GHz-71 GHz), FR4 (52.6 GHz-114.25 GHz), and FR5 (114.25 GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

With the above aspects in mind, unless specifically stated otherwise, itshould be understood that the term “sub-6 GHz” or the like if usedherein may broadly represent frequencies that may be less than 6 GHz,may be within FR1, or may include mid-band frequencies. Further, unlessspecifically stated otherwise, it should be understood that the term“millimeter wave” or the like if used herein may broadly representfrequencies that may include mid-band frequencies, may be within FR2,FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.

A base station 102, whether a small cell 102′ or a large cell (e.g.,macro base station), may include and/or be referred to as an eNB, gNodeB(gNB), or another type of base station. Some base stations, such as gNB180 may operate in a traditional sub 6 GHz spectrum, in millimeter wavefrequencies, and/or near millimeter wave frequencies in communicationwith the UE 104. When the gNB 180 operates in millimeter wave or nearmillimeter wave frequencies, the gNB 180 may be referred to as amillimeter wave base station. The millimeter wave base station 180 mayutilize beamforming 182 with the UE 104 to compensate for the path lossand short range. The base station 180 and the UE 104 may each include aplurality of antennas, such as antenna elements, antenna panels, and/orantenna arrays to facilitate the beamforming.

The base station 180 may transmit a beamformed signal to the UE 104 inone or more transmit directions 182′. The UE 104 may receive thebeamformed signal from the base station 180 in one or more receivedirections 182″. The UE 104 may also transmit a beamformed signal to thebase station 180 in one or more transmit directions. The base station180 may receive the beamformed signal from the UE 104 in one or morereceive directions. The base station 180/UE 104 may perform beamtraining to determine the best receive and transmit directions for eachof the base station 180/UE 104. The transmit and receive directions forthe base station 180 may or may not be the same. The transmit andreceive directions for the UE 104 may or may not be the same.

The EPC 160 may include a Mobility Management Entity (MME) 162, otherMMES 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 104 andthe EPC 160. Generally, the MME 162 provides bearer and connectionmanagement. All user Internet protocol (IP) packets are transferredthrough the Serving Gateway 166, which itself is connected to the PDNGateway 172. The PDN Gateway 172 provides UE IP address allocation aswell as other functions. The PDN Gateway 172 and the BM-SC 170 areconnected to the IP Services 176. The IP Services 176 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, and/or other IP services. The BM-SC 170 may provide functionsfor MBMS user service provisioning and delivery. The BM-SC 170 may serveas an entry point for content provider MBMS transmission, may be used toauthorize and initiate MBMS Bearer Services within a public land mobilenetwork (PLMN), and may be used to schedule MBMS transmissions. The MBMSGateway 168 may be used to distribute MBMS traffic to the base stations102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN)area broadcasting a particular service, and may be responsible forsession management (start/stop) and for collecting eMBMS relatedcharging information.

The core network 190 may include an Access and Mobility ManagementFunction (AMF) 192, other AMFs 193, a Session Management Function (SMF)194, and a User Plane Function (UPF) 195. The AMF 192 may be incommunication with a Unified Data Management (UDM) 196. The AMF 192 isthe control node that processes the signaling between the UEs 104 andthe core network 190. Generally, the AMF 192 provides QoS flow andsession management. All user Internet protocol (IP) packets aretransferred through the UPF 195. The UPF 195 provides UE IP addressallocation as well as other functions. The UPF 195 is connected to theIP Services 197. The IP Services 197 may include the Internet, anintranet, an IP Multimedia Subsystem (IMS), a Packet Switch (PS)Streaming (PSS) Service, and/or other IP services.

The base station may include and/or be referred to as a gNB, Node B,eNB, an access point, a base transceiver station, a radio base station,a radio transceiver, a transceiver function, a basic service set (BSS),an extended service set (ESS), a transmit reception point (TRP), or someother suitable terminology. The base station 102 provides an accesspoint to the EPC 160 or core network 190 for a UE 104. Examples of UEs104 include a cellular phone, a smart phone, a session initiationprotocol (SIP) phone, a laptop, a personal digital assistant (PDA), asatellite radio, a global positioning system, a multimedia device, avideo device, a digital audio player (e.g., MP3 player), a camera, agame console, a tablet, a smart device, a wearable device, a vehicle, anelectric meter, a gas pump, a large or small kitchen appliance, ahealthcare device, an implant, a sensor/actuator, a display, or anyother similar functioning device. Some of the UEs 104 may be referred toas IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heartmonitor, etc.). The UE 104 may also be referred to as a station, amobile station, a subscriber station, a mobile unit, a subscriber unit,a wireless unit, a remote unit, a mobile device, a wireless device, awireless communications device, a remote device, a mobile subscriberstation, an access terminal, a mobile terminal, a wireless terminal, aremote terminal, a handset, a user agent, a mobile client, a client, orsome other suitable terminology. In some scenarios, the term UE may alsoapply to one or more companion devices such as in a device constellationarrangement. One or more of these devices may collectively access thenetwork and/or individually access the network.

Referring again to FIG. 1, in certain aspects, the UE 104 may include amulti-CORESET PDCCH aggregation component 198 configured to receive asearch space configuration for a search space, the search spaceconfiguration configuring the search space to be associated with aplurality of active CORESETs, and monitor for a PDCCH within theconfigured search space during one or more monitoring occasions, whereat least one PDCCH candidate includes components associated withdifferent CORESETs on different monitoring occasions. In certainaspects, the base station 180 may include a multi-CORESET PDCCHaggregation component 199 configured to transmit a search spaceconfiguration for a search space, the search space configurationconfiguring the search space to be associated with a plurality of activeCORESET, and transmit a PDCCH within the configured search space duringone or more monitoring occasions, where at least one PDCCH candidateincludes components associated with different CORESETs on differentmonitoring occasions. Although the following description may be focusedon 5G NR, the concepts described herein may be applicable to othersimilar areas, such as LTE, LTE-A, CDMA, GSM, and other wirelesstechnologies.

FIG. 2A is a diagram 200 illustrating an example of a first subframewithin a 5G NR frame structure. FIG. 2B is a diagram 230 illustrating anexample of DL channels within a 5G NR subframe. FIG. 2C is a diagram 250illustrating an example of a second subframe within a 5G NR framestructure. FIG. 2D is a diagram 280 illustrating an example of ULchannels within a 5G NR subframe. The 5G NR frame structure may befrequency division duplexed (FDD) in which for a particular set ofsubcarriers (carrier system bandwidth), subframes within the set ofsubcarriers are dedicated for either DL or UL, or may be time divisionduplexed (TDD) in which for a particular set of subcarriers (carriersystem bandwidth), subframes within the set of subcarriers are dedicatedfor both DL and UL. In the examples provided by FIGS. 2A, 2C, the 5G NRframe structure is assumed to be TDD, with subframe 4 being configuredwith slot format 28 (with mostly DL), where D is DL, U is UL, and F isflexible for use between DL/UL, and subframe 3 being configured withslot format 1 (with all UL). While subframes 3, 4 are shown with slotformats 1, 28, respectively, any particular subframe may be configuredwith any of the various available slot formats 0-61. Slot formats 0, 1are all DL, UL, respectively. Other slot formats 2-61 include a mix ofDL, UL, and flexible symbols. UEs are configured with the slot format(dynamically through DL control information (DCI), orsemi-statically/statically through radio resource control (RRC)signaling) through a received slot format indicator (SFI). Note that thedescription infra applies also to a 5G NR frame structure that is TDD.

FIGS. 2A-2D illustrate a frame structure, and the aspects of the presentdisclosure may be applicable to other wireless communicationtechnologies, which may have a different frame structure and/ordifferent channels. A frame (10 ms) may be divided into 10 equally sizedsubframes (1 ms). Each subframe may include one or more time slots.Subframes may also include mini-slots, which may include 7, 4, or 2symbols. Each slot may include 14 or 12 symbols, depending on whetherthe cyclic prefix (CP) is normal or extended. For normal CP, each slotmay include 14 symbols, and for extended CP, each slot may include 12symbols. The symbols on DL may be CP orthogonal frequency divisionmultiplexing (OFDM) (CP-OFDM) symbols. The symbols on UL may be CP-OFDMsymbols (for high throughput scenarios) or discrete Fourier transform(DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as singlecarrier frequency-division multiple access (SC-FDMA) symbols) (for powerlimited scenarios; limited to a single stream transmission). The numberof slots within a subframe is based on the CP and the numerology. Thenumerology defines the subcarrier spacing (SC S) and, effectively, thesymbol length/duration, which is equal to 1/SCS.

μ SCS Δf = 2^(μ) · 15 [kHz] Cyclic pre fix 0 15 Normal 1 30 Normal 2 60Normal, Extended 3 120 Normal 4 240 Normal

For normal CP (14 symbols/slot), different numerologies μ 0 to 4 allowfor 1, 2, 4, 8, and 16 slots, respectively, per subframe. For extendedCP, the numerology 2 allows for 4 slots per subframe. Accordingly, fornormal CP and numerology μ, there are 14 symbols/slot and 2^(μ)slots/subframe. The subcarrier spacing may be equal to 2^(μ)*15 kHz,where μ is the numerology 0 to 4. As such, the numerology μ=0 has asubcarrier spacing of 15 kHz and the numerology μ=4 has a subcarrierspacing of 240 kHz. The symbol length/duration is inversely related tothe subcarrier spacing. FIGS. 2A-2D provide an example of normal CP with14 symbols per slot and numerology μ=2 with 4 slots per subframe. Theslot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and thesymbol duration is approximately 16.67 μs. Within a set of frames, theremay be one or more different bandwidth parts (BWPs) (see FIG. 2B) thatare frequency division multiplexed. Each BWP may have a particularnumerology and CP (normal or extended).

A resource grid may be used to represent the frame structure. Each timeslot includes a resource block (RB) (also referred to as physical RBs(PRBs)) that extends 12 consecutive subcarriers. The resource grid isdivided into multiple resource elements (REs). The number of bitscarried by each RE depends on the modulation scheme.

As illustrated in FIG. 2A, some of the REs carry reference (pilot)signals (RS) for the UE. The RS may include demodulation RS (DM-RS)(indicated as R for one particular configuration, but other DM-RSconfigurations are possible) and channel state information referencesignals (CSI-RS) for channel estimation at the UE. The RS may alsoinclude beam measurement RS (BRS), beam refinement RS (BRRS), and phasetracking RS (PT-RS).

FIG. 2B illustrates an example of various DL channels within a subframeof a frame. The physical downlink control channel (PDCCH) carries DCIwithin one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or16 CCEs), each CCE including six RE groups (REGs), each REG including 12consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP maybe referred to as a control resource set (CORESET). A UE is configuredto monitor PDCCH candidates in a PDCCH search space (e.g., common searchspace, UE-specific search space) during PDCCH monitoring occasions onthe CORESET, where the PDCCH candidates have different DCI formats anddifferent aggregation levels. Additional BWPs may be located at greaterand/or lower frequencies across the channel bandwidth. A primarysynchronization signal (PSS) may be within symbol 2 of particularsubframes of a frame. The PSS is used by a UE 104 to determinesubframe/symbol timing and a physical layer identity. A secondarysynchronization signal (SSS) may be within symbol 4 of particularsubframes of a frame. The SSS is used by a UE to determine a physicallayer cell identity group number and radio frame timing. Based on thephysical layer identity and the physical layer cell identity groupnumber, the UE can determine a physical cell identifier (PCI). Based onthe PCI, the UE can determine the locations of the DM-RS. The physicalbroadcast channel (PBCH), which carries a master information block(MIB), may be logically grouped with the PSS and SSS to form asynchronization signal (SS)/PBCH block (also referred to as SS block(SSB)). The MIB provides a number of RBs in the system bandwidth and asystem frame number (SFN). The physical downlink shared channel (PDSCH)carries user data, broadcast system information not transmitted throughthe PBCH such as system information blocks (SIBs), and paging messages.

As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as Rfor one particular configuration, but other DM-RS configurations arepossible) for channel estimation at the base station. The UE maytransmit DM-RS for the physical uplink control channel (PUCCH) and DM-RSfor the physical uplink shared channel (PUSCH). The PUSCH DM-RS may betransmitted in the first one or two symbols of the PUSCH. The PUCCHDM-RS may be transmitted in different configurations depending onwhether short or long PUCCHs are transmitted and depending on theparticular PUCCH format used. The UE may transmit sounding referencesignals (SRS). The SRS may be transmitted in the last symbol of asubframe. The SRS may have a comb structure, and a UE may transmit SRSon one of the combs. The SRS may be used by a base station for channelquality estimation to enable frequency-dependent scheduling on the UL.

FIG. 2D illustrates an example of various UL channels within a subframeof a frame. The PUCCH may be located as indicated in one configuration.The PUCCH carries uplink control information (UCI), such as schedulingrequests, a channel quality indicator (CQI), a precoding matrixindicator (PMI), a rank indicator (RI), and hybrid automatic repeatrequest (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback (i.e., one ormore HARQ ACK bits indicating one or more ACK and/or negative ACK(NACK)). The PUSCH carries data, and may additionally be used to carry abuffer status report (BSR), a power headroom report (PHR), and/or UCI.

FIG. 3 is a block diagram of a base station 310 in communication with aUE 350 in an access network. In the DL, IP packets from the EPC 160 maybe provided to a controller/processor 375. The controller/processor 375implements layer 3 and layer 2 functionality. Layer 3 includes a radioresource control (RRC) layer, and layer 2 includes a service dataadaptation protocol (SDAP) layer, a packet data convergence protocol(PDCP) layer, a radio link control (RLC) layer, and a medium accesscontrol (MAC) layer. The controller/processor 375 provides RRC layerfunctionality associated with broadcasting of system information (e.g.,MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRCconnection establishment, RRC connection modification, and RRCconnection release), inter radio access technology (RAT) mobility, andmeasurement configuration for UE measurement reporting; PDCP layerfunctionality associated with header compression/decompression, security(ciphering, deciphering, integrity protection, integrity verification),and handover support functions; RLC layer functionality associated withthe transfer of upper layer packet data units (PDUs), error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC servicedata units (SDUs), re-segmentation of RLC data PDUs, and reordering ofRLC data PDUs; and MAC layer functionality associated with mappingbetween logical channels and transport channels, multiplexing of MACSDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs,scheduling information reporting, error correction through HARQ,priority handling, and logical channel prioritization.

The transmit (TX) processor 316 and the receive (RX) processor 370implement layer 1 functionality associated with various signalprocessing functions. Layer 1, which includes a physical (PHY) layer,may include error detection on the transport channels, forward errorcorrection (FEC) coding/decoding of the transport channels,interleaving, rate matching, mapping onto physical channels,modulation/demodulation of physical channels, and MIMO antennaprocessing. The TX processor 316 handles mapping to signalconstellations based on various modulation schemes (e.g., binaryphase-shift keying (BPSK), quadrature phase-shift keying (QPSK),M-phase-shift keying (M-PSK), M-quadrature amplitude modulation(M-QAM)). The coded and modulated symbols may then be split intoparallel streams. Each stream may then be mapped to an OFDM subcarrier,multiplexed with a reference signal (e.g., pilot) in the time and/orfrequency domain, and then combined together using an Inverse FastFourier Transform (IFFT) to produce a physical channel carrying a timedomain OFDM symbol stream. The OFDM stream is spatially precoded toproduce multiple spatial streams. Channel estimates from a channelestimator 374 may be used to determine the coding and modulation scheme,as well as for spatial processing. The channel estimate may be derivedfrom a reference signal and/or channel condition feedback transmitted bythe UE 350. Each spatial stream may then be provided to a differentantenna 320 via a separate transmitter 318 TX. Each transmitter 318 TXmay modulate a radio frequency (RF) carrier with a respective spatialstream for transmission.

At the UE 350, each receiver 354 RX receives a signal through itsrespective antenna 352. Each receiver 354 RX recovers informationmodulated onto an RF carrier and provides the information to the receive(RX) processor 356. The TX processor 368 and the RX processor 356implement layer 1 functionality associated with various signalprocessing functions. The RX processor 356 may perform spatialprocessing on the information to recover any spatial streams destinedfor the UE 350. If multiple spatial streams are destined for the UE 350,they may be combined by the RX processor 356 into a single OFDM symbolstream. The RX processor 356 then converts the OFDM symbol stream fromthe time-domain to the frequency domain using a Fast Fourier Transform(FFT). The frequency domain signal comprises a separate OFDM symbolstream for each subcarrier of the OFDM signal. The symbols on eachsubcarrier, and the reference signal, are recovered and demodulated bydetermining the most likely signal constellation points transmitted bythe base station 310. These soft decisions may be based on channelestimates computed by the channel estimator 358. The soft decisions arethen decoded and deinterleaved to recover the data and control signalsthat were originally transmitted by the base station 310 on the physicalchannel. The data and control signals are then provided to thecontroller/processor 359, which implements layer 3 and layer 2functionality.

The controller/processor 359 can be associated with a memory 360 thatstores program codes and data. The memory 360 may be referred to as acomputer-readable medium. In the UL, the controller/processor 359provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, and control signalprocessing to recover IP packets from the EPC 160. Thecontroller/processor 359 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DLtransmission by the base station 310, the controller/processor 359provides RRC layer functionality associated with system information(e.g., MIB, SIBs) acquisition, RRC connections, and measurementreporting; PDCP layer functionality associated with headercompression/decompression, and security (ciphering, deciphering,integrity protection, integrity verification); RLC layer functionalityassociated with the transfer of upper layer PDUs, error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC SDUs,re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; andMAC layer functionality associated with mapping between logical channelsand transport channels, multiplexing of MAC SDUs onto TBs,demultiplexing of MAC SDUs from TBs, scheduling information reporting,error correction through HARQ, priority handling, and logical channelprioritization.

Channel estimates derived by a channel estimator 358 from a referencesignal or feedback transmitted by the base station 310 may be used bythe TX processor 368 to select the appropriate coding and modulationschemes, and to facilitate spatial processing. The spatial streamsgenerated by the TX processor 368 may be provided to different antenna352 via separate transmitters 354TX. Each transmitter 354TX may modulatean RF carrier with a respective spatial stream for transmission.

The UL transmission is processed at the base station 310 in a mannersimilar to that described in connection with the receiver function atthe UE 350. Each receiver 318RX receives a signal through its respectiveantenna 320. Each receiver 318RX recovers information modulated onto anRF carrier and provides the information to a RX processor 370.

The controller/processor 375 can be associated with a memory 376 thatstores program codes and data. The memory 376 may be referred to as acomputer-readable medium. In the UL, the controller/processor 375provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, control signal processingto recover IP packets from the UE 350. IP packets from thecontroller/processor 375 may be provided to the EPC 160. Thecontroller/processor 375 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

At least one of the TX processor 368, the RX processor 356, and thecontroller/processor 359 may be configured to perform aspects inconnection with 198 of FIG. 1. At least one of the TX processor 316, theRX processor 370, and the controller/processor 375 may be configured toperform aspects in connection with 199 of FIG. 1.

In 5G NR, a PDCCH is transmitted over a Control Resource Set (CORESET)which can have 1, 2, or 3 OFDM symbols. That is, a base station maytransmit a PDCCH to a UE in the CORESET, and the CORESET may havemultiple OFDM symbols in time domain. For example, the CORESET may beallocated with 1, 2, or 3 OFDM symbols in the time domain.

A set of potential PDCCH candidates is called a search space and thesearch space is associated with a CORESET. That is, the base station mayconfigure search spaces including a set of potential PDCCH candidates,and indicate the configuration of the search spaces to the UE. Forexample, the base station may indicate the configuration of the searchspaces to the UE by an RRC message. The UE may monitor the search spaceto receive the PDCCH from the base station. The search spaces forreceiving the PDCCH may be UE-specific. That is, the UE may beconfigured to monitor the UE-specific search spaces including the PDCCHcandidates to receive the PDCCH. The search spaces that are notUE-specific may be common search spaces, and UE may be monitoring thecommon search spaces. Each search space may be associated with oneCORESET.

The search space can have configurable monitoring occasions to definethe periodicity of the search space (in terms of number of slots) and aset of symbols indicating a beginning of each monitoring occasion in amonitored slot (so, there can be multiple monitoring occasions per oneslot). That is, the base station may configure the monitoring occasionsof the search spaces to define the periodicity of the search spaces overthe number of slots. Therefore, the periodicity of the search spaces maybe defined in a period slot number by which the monitoring occasions areallocated. Furthermore, each of the monitored slots may include multiplemonitoring occasions, and the set of symbols may indicate the beginningof each monitoring occasion in the monitored slot.

For each search space, a set of aggregation levels for the PDCCHcandidates may be configured (which can be a subset of possibleaggregation levels: {1, 2, 4, 8, 16}), and the aggregation levels may bethe same for all monitoring occasions. That is, the PDCCH candidates mayinclude at least one control channel element (CCE, referring to FIG. 4,CCE 402), and the number of CCEs allocated in frequency domain for eachof the PDCCH candidates may be defined by the aggregation level of eachof the PDCCH candidates. For example, a PDCCH candidate with anaggregation level of 2 may include 2 CCEs aggregated in the PDCCHcandidate, spanning in the frequency domain, and a PDCCH candidate withan aggregation level of 4 may include 4 CCEs aggregated in the PDCCHcandidate, spanning in the frequency domain.

Increasing the number of OFDM symbols for the PDCCH transmission may bea way to increase the coverage of the PDCCH. That is, the coverage ofthe PDCCH may be increased by increasing the number of the OFDM symbolsof the PDCCH transmission in the time domain. Also, including the PDCCHover different bandwidth parts (BWPs) or different component carriers(CCs) can improve performance by added frequency diversity. That is, theperformance of the PDCCH may be improved by adding frequency diversityby allocating the PDCCH over different BWPs or different CCs. Forexample, a group-common DCI can activate a preconfigured monitoringaggregation (i.e., a grouping of PDCCH monitoring occasions forrepetition of the same PDCCH). That is, multiple PDCCH monitoringoccasions may be formed into a group of PDCCH monitoring occasions, anda group-common DCI may be transmitted to the UE to activate apreconfigured monitoring aggregation among the group of PDCCH monitoringoccasions.

Current disclosure provides a method and/or apparatus to improve thecoverage of the PDCCH. In some aspects, a method of wirelesscommunication may include a UE and a base station with improved coverageof the PDCCH. A search space may be configured with a first CORESET anda second CORESET, and the PDCCH may be transmitted within the configuredsearch space. Here, at least one PDCCH candidate may include componentsassociated with different CORESETs on different monitoring occasions.

FIG. 4 illustrates an example of a search space 400 associated withmultiple CORESETs 410 and 420. The search space 400 may be associatedwith multiple active CORESETs 410 and 420 simultaneously. That is, thesearch space 400 may be associated with a plurality of CORESETsincluding a first CORESET 410 and a second CORESET 420. Here, the searchspace 400 associated with the first CORESET 410 and the second CORESET420 may refer to the search space 400 being associated with the firstCORESET 410 and the second CORESET 420 that are both active, and bedistinguished from switching between the first CORESET 410 and thesecond CORESET 420 or activating one of the first CORESET 410 and thesecond CORESET 420.

In one aspect, the active CORESETs associated with a search space may beon different bandwidth parts (BWPs) and/or different carrier components(CCs). For example, the first CORESET 410 and the second CORESET 420associated with the search space 400 may be on different BWPs. In otherwords, the search space 400 may be associated with the first CORESET 410in a first BWP and the second CORESET 420 in a second BWP different fromthe first BWP. For example, the first CORESET 410 and the second CORESET420 associated with the search space 400 may be on different CCs. Inother words, the search space 400 may be associated with the firstCORESET 410 in a first CC and the second CORESET 420 in a second CCdifferent from the first CC.

In one aspect, different monitoring occasions of the search space may beassociated with different CORESETs. For example, the first CORESET 410and the second CORESET 420 may be associated with different monitoringoccasions of the search space 400. In other words, the search space 400may include a first monitoring occasion associated with the firstCORESET 410 and a second monitoring occasion associated with the secondCORESET 420. Also, one monitoring occasion may be associated withmultiple CORESETs. For example, the first CORESET 410 and the secondCORESET 420 may be associated with one monitoring occasion of the searchspace 400.

The plurality of CORESETs including the first CORESET 410 and the secondCORESET 420 may include a plurality of PDCCH candidates having differentaggregation levels. For example, the first CORESET 410 may include afirst PDCCH candidate 412 with an aggregation level of 2, and the secondCORESET 420 may include a second PDCCH candidate 422 having anaggregation level of 4.

In one aspect, a search space may include PDCCH candidates withcomponents across multiple CORESETs. For example, the first CORESET 410and the second CORESET 420 may include a third PDCCH candidate with anaggregation level of 8, the first CORESET 410 including a firstcomponent 414 of the third PDCCH candidate and a second CORESET 420including a second component 424 of the third PDCCH candidate. That is,the third PDCCH candidate with an aggregation level of 8 may include thefirst component 414 in the first CORESET 410 and the second component424 in the second CORESET 420.

In one aspect, the aggregation across multiple CORESETs may be appliedfor aggregation levels higher than a certain threshold. That is, thePDCCH candidate with components across multiple CORESETs associated witha single search space may be applied in response to determining that theaggregation of the PDCCH candidate level is greater than a thresholdvalue. For example, in response to determining that the aggregationlevel of 8 of the third PDCCH candidate is greater than the thresholdvalue, the third PDCCH candidate may be aggregated across the firstCORESET 410 and the second CORESET 420, with the first component 414 inthe first CORESET 410 and the second component 424 in the second CORESET420.

In one aspect, the minimum threshold may be defined in a standardspecification. That is, a set of parameters or a rule may be predefinedand agreed upon between the base station and the UE regarding thethreshold value to apply the aggregation of the PDCCH candidate acrossmultiple CORESETs associated with a single search space.

In one aspect, the minimum threshold may depend on frequency range,frequency band, subcarrier spacing, and/or number of OFDM symbols of theassociated CORESETs and/or size of the CORESETs in terms of the numberof RBs.

In one aspect, the threshold may be equal to the maximum aggregationlevel supported by a single CORESET. For example, the maximum PDCCHaggregation level supported by the single CORESET may be 32 and/or 64.Referring to FIG. 4, the maximum PDCCH aggregation level supported bythe first CORESET 410 and the second CORESET 420 may be 8, andtherefore, the third PDCCH candidate with the aggregation level of 8 maybe applied across the first CORESET 410 and the second CORESET 420, withthe first component 414 in the first CORESET 410 and the secondcomponent 424 in the second CORESET 420.

The threshold may be configured as part of a search space configuration.That is, the base station may configure the threshold value to the UE aspart of the search space configuration to the UE. For example, thethreshold may change by explicit dynamic signaling (e.g., UE-specific orgroup-common DCI or MAC-CE), and the threshold may change by implicitindication based on another dynamic signaling (e.g., indication ofcoverage enhancement). That is, the base station may instruct the UE tochange the threshold value to apply the aggregation of the PDCCH acrossmultiple CORESETS explicitly based on the dynamic signaling from thebase station, such as the DCI or the MAC-CE, or implicitly based onanother dynamic signaling, such as the indication to enhance thecoverage of the PDCCH.

For a PDCCH candidate with aggregation across one or more CORESETs, thecomponents on each CORESET may be PDCCH candidates of the search space.That is, the first component 414 of the third PDCCH may be a fourthPDCCH candidate of the search space 400 in the first CORESET 410, andthe second component 424 of the third PDCCH may be a fifth PDCCHcandidate of the search space 400 in the second CORESET 420.

FIG. 5 is a call-flow diagram 500 of a method of wireless communication.The call-flow diagram 500 may include a UE 502 and a base station 504.The base station 504 may configure a search space with a first CORESETand a second CORESET, and the PDCCH may be transmitted within theconfigured search space, where at least one PDCCH candidate may includecomponents associated with different CORESETs on different monitoringoccasions. The UE 502 may monitor for a PDCCH within the configuredsearch space during one or more monitoring occasions, where at least onePDCCH candidate may include components associated with differentCORESETs on different monitoring occasions.

At 506, the base station 504 may transmit a search space configurationfor a search space, the search space configuration configuring thesearch space to be associated with a plurality of active CORESET. The UE502 may receive a search space configuration for a search space, thesearch space configuration configuring the search space to be associatedwith a plurality of active CORESETs.

At 507, the base station 504 may transmit a configuration indicating anaggregation level (AL) threshold, and the UE 502 may receive theconfiguration indicating the AL threshold. In some aspects, the PDCCHcandidates in the third subset of the PDCCH candidates each may have anAL greater than an AL threshold. For example, the AL threshold may be16, and the PDCCH candidates in the first subset of the PDCCH candidateseach have an AL equal to 2^(n), where n≥5. A configuration indicatingthe AL threshold may be transmitted from the base station 504 to the UE502. The configuration may be transmitted and received implicitly basedon other signaling within one of DCI or a MAC-CE, or implicitly based onother signaling within one of DCI or a MAC-CE.

At 508, the base station 504 may transmit the PDCCH within theconfigured search space during one or more monitoring occasions, whereat least one PDCCH candidate includes components associated withdifferent CORESETs on different monitoring occasions.

At 510, the UE 502 may monitor for a PDCCH within the configured searchspace during one or more monitoring occasions, where at least one PDCCHcandidate includes components associated with different CORESETs ondifferent monitoring occasions. That is, the UE 502 may monitor for thePDCCH within the configured search space to receive the PDCCHtransmitted, from the base station 504 at 508. For example, the UE 502may monitor the physical resources within a specific area in a downlinkresource grid as indicated by the search space configuration to receivethe PDCCH.

In one aspect, the UE 502 may monitor for PDCCH candidates within one ofthe plurality of active CORESETs based on a monitoring occasion of theone or more monitoring occasions. That is, the UE 502 may monitor forthe PDCCH candidates within a first CORESET of the plurality of activeCORESETs based on a first monitoring occasion, and monitor for the PDCCHcandidates within a second CORESET of the plurality of active CORESETsbased on a second monitoring occasion, the second monitoring occasionbeing non-concurrent with the first monitoring occasion. The pluralityof active CORESETs may be associated with a plurality of different BWPs,or the plurality of active CORESETs may be associated with a pluralityof different CCs.

In some aspects, the UE 502 may monitor for PDCCH candidates within theplurality of active CORESETs. In one aspect, the UE 502 may monitor fora first subset of the PDCCH candidates within a first CORESET of theplurality of active CORESETs in a monitoring occasion, and monitor for asecond subset of the PDCCH candidates within a second CORESET of theplurality of active CORESETs in the monitoring occasion. The firstsubset of the PDCCH candidates monitored within the first CORESET andthe second subset of the PDCCH candidates monitored within the secondCORESET may be based on a monitoring occasion.

In another aspect, the UE 502 may monitor for a third subset of thePDCCH candidates within a first CORESET and a second CORESET of theplurality of active CORESETs, a first component of each PDCCH candidateof the third subset of the PDCCH candidates being within the firstCORESET, a second component of each PDCCH candidate of the third subsetof the PDCCH candidates being within the second CORESET. The firstcomponent and the second component may be based on a monitoringoccasion. At least one of the first component may itself be a PDCCHcandidate within the first subset of the PDCCH candidates, or the secondcomponent may itself be a PDCCH candidate within the second subset ofthe PDCCH candidates.

FIG. 6 is a flowchart 600 of a method of wireless communication. Themethod may be performed by a UE (e.g., the UE 104/502; the apparatus1002). The UE may monitor for a PDCCH within the configured search spaceduring one or more monitoring occasions, where at least one PDCCHcandidate may include components associated with different CORESETs ondifferent monitoring occasions.

At 602, the UE may receive a search space configuration for a searchspace, the search space configuration configuring the search space to beassociated with a plurality of active CORESETs. For example, at 506, theUE 502 may receive a search space configuration for a search space, thesearch space configuration configuring the search space to be associatedwith a plurality of active CORESETs. Furthermore, 602 may be performedby a search space configuration component 1040.

At 603, the UE may receive a configuration indicating the AL threshold.In some aspects, the PDCCH candidates in the third subset of the PDCCHcandidates each have an AL greater than an AL threshold. For example,the AL threshold may be 16, and the PDCCH candidates in the first subsetof the PDCCH candidates each have an AL equal to 2^(n), where n≥5. Aconfiguration indicating the AL threshold may be transmitted from thebase station to the UE. The configuration may be received implicitlybased on other signaling within one of DCI or a MAC-CE, or implicitlybased on other signaling within one of DCI or a MAC-CE. For example, at507, the UE 502 may receive the configuration indicating the ALthreshold. Furthermore, 604 may be performed by the search spaceconfiguration component 1040.

At 604, the UE may monitor for a PDCCH within the configured searchspace during one or more monitoring occasions, where at least one PDCCHcandidate includes components associated with different CORESETs ondifferent monitoring occasions. That is, the UE may monitor for thePDCCH within the configured search space to receive the PDCCHtransmitted, from the base station (e.g., at 704, referring to FIG. 6).For example, the UE may monitor the physical resources within a specificarea in a downlink resource grid as indicated by the search spaceconfiguration to receive the PDCCH. For example, at 510, the UE 502 maymonitor for the PDCCH within the configured search space during one ormore monitoring occasions, where at least one PDCCH candidate includescomponents associated with different CORESETs on different monitoringoccasions. Furthermore, 604 may be performed by a PDCCH monitoringcomponent 1042.

In one aspect, the UE may monitor for PDCCH candidates within one of theplurality of active CORESETs based on a monitoring occasion of the oneor more monitoring occasions. That is, the UE may monitor for the PDCCHcandidates within a first CORESET of the plurality of active CORESETsbased on a first monitoring occasion, and monitor for the PDCCHcandidates within a second CORESET of the plurality of active CORESETsbased on a second monitoring occasion, the second monitoring occasionbeing non-concurrent with the first monitoring occasion. The pluralityof active CORESETs may be associated with a plurality of different BWPs,or the plurality of active CORESETs may be associated with a pluralityof different CCs.

In some aspects, the UE may monitor for PDCCH candidates within theplurality of active CORESETs. In one aspect, the UE may monitor for afirst subset of the PDCCH candidates within a first CORESET of theplurality of active CORESETs in a monitoring occasion, and monitor for asecond subset of the PDCCH candidates within a second CORESET of theplurality of active CORESETs in the monitoring occasion. The firstsubset of the PDCCH candidates monitored within the first CORESET andthe second subset of the PDCCH candidates monitored within the secondCORESET may be based on a monitoring occasion.

In another aspect, the UE may monitor for a third subset of the PDCCHcandidates within a first CORESET and a second CORESET of the pluralityof active CORESETs, a first component of each PDCCH candidate of thethird subset of the PDCCH candidates being within the first CORESET, asecond component of each PDCCH candidate of the third subset of thePDCCH candidates being within the second CORESET. The first componentand the second component may be based on a monitoring occasion. At leastone of the first component may itself be a PDCCH candidate within thefirst subset of the PDCCH candidates, or the second component may itselfbe a PDCCH candidate within the second subset of the PDCCH candidates.

FIG. 7 is a flowchart 700 of a method of wireless communication. Themethod may be performed by a UE (e.g., the UE 104/502; the apparatus1002). The UE may monitor for a PDCCH within the configured search spaceduring one or more monitoring occasions, where at least one PDCCHcandidate may include components associated with different CORESETs ondifferent monitoring occasions.

At 702, the UE may receive a search space configuration for a searchspace, the search space configuration configuring the search space to beassociated with a plurality of active CORESETs. For example, at 506, theUE 502 may receive a search space configuration for a search space, thesearch space configuration configuring the search space to be associatedwith a plurality of active CORESETs. Furthermore, 702 may be performedby a search space configuration component 1040.

At 704, the UE may monitor for a PDCCH within the configured searchspace during one or more monitoring occasions, where at least one PDCCHcandidate includes components associated with different CORESETs ondifferent monitoring occasions. That is, the UE may monitor for thePDCCH within the configured search space to receive the PDCCHtransmitted, from the base station (e.g., at 704, referring to FIG. 7).For example, the UE may monitor the physical resources within a specificarea in a downlink resource grid as indicated by the search spaceconfiguration to receive the PDCCH. For example, at 510, the UE 502 maymonitor for the PDCCH within the configured search space during one ormore monitoring occasions, where at least one PDCCH candidate includescomponents associated with different CORESETs on different monitoringoccasions. Furthermore, 704 may be performed by a PDCCH monitoringcomponent 1042.

In one aspect, the UE may monitor for PDCCH candidates within one of theplurality of active CORESETs based on a monitoring occasion of the oneor more monitoring occasions. That is, the UE may monitor for the PDCCHcandidates within a first CORESET of the plurality of active CORESETsbased on a first monitoring occasion, and monitor for the PDCCHcandidates within a second CORESET of the plurality of active CORESETsbased on a second monitoring occasion, the second monitoring occasionbeing non-concurrent with the first monitoring occasion. The pluralityof active CORESETs may be associated with a plurality of different BWPs,or the plurality of active CORESETs may be associated with a pluralityof different CCs.

In some aspects, the UE may monitor for PDCCH candidates within theplurality of active CORESETs. In one aspect, the UE may monitor for afirst subset of the PDCCH candidates within a first CORESET of theplurality of active CORESETs in a monitoring occasion, and monitor for asecond subset of the PDCCH candidates within a second CORESET of theplurality of active CORESETs in the monitoring occasion. The firstsubset of the PDCCH candidates monitored within the first CORESET andthe second subset of the PDCCH candidates monitored within the secondCORESET may be based on a monitoring occasion.

In another aspect, the UE may monitor for a third subset of the PDCCHcandidates within a first CORESET and a second CORESET of the pluralityof active CORESETs, a first component of each PDCCH candidate of thethird subset of the PDCCH candidates being within the first CORESET, asecond component of each PDCCH candidate of the third subset of thePDCCH candidates being within the second CORESET. The first componentand the second component may be based on a monitoring occasion. At leastone of the first component may itself be a PDCCH candidate within thefirst subset of the PDCCH candidates, or the second component may itselfbe a PDCCH candidate within the second subset of the PDCCH candidates.

FIG. 8 is a flowchart 800 of a method of wireless communication. Themethod may be performed by a base station (e.g., the base station102/180/504; the apparatus 1102). The base station may configure asearch space with a first CORESET and a second CORESET, and the PDCCHmay be transmitted within the configured search space, where at leastone PDCCH candidate may include components associated with differentCORESETs on different monitoring occasions.

At 802, the base station may transmit a search space configuration for asearch space, the search space configuration configuring the searchspace to be associated with a plurality of active CORESET. For example,at 506, base station 504 may transmit a search space configuration for asearch space, the search space configuration configuring the searchspace to be associated with a plurality of active CORESET. Furthermore,802 may be performed by a search space configuration component 1140.

At 803, the base station may transmit a configuration indicating an ALthreshold. In some aspects, the PDCCH candidates in the third subset ofthe PDCCH candidates each have an AL greater than an AL threshold. Forexample, the AL threshold may be 16, and the PDCCH candidates in thefirst subset of the PDCCH candidates each have an AL equal to 2^(n),where n≥5. A configuration indicating the AL threshold may betransmitted from the base station to the base station. The configurationmay be received implicitly based on other signaling within one of DCI ora MAC-CE, or implicitly based on other signaling within one of DCI or aMAC-CE. For example, at 507, the base station 504 may transmit aconfiguration indicating an AL threshold. Furthermore, 803 may beperformed by a search space configuration component 1140.

At 804, the base station may transmit the PDCCH within the configuredsearch space during one or more monitoring occasions, where at least onePDCCH candidate includes components associated with different CORESETson different monitoring occasions. For example, at 508, the base station504 may transmit the PDCCH within the configured search space during oneor more monitoring occasions, where at least one PDCCH candidateincludes components associated with different CORESETs on differentmonitoring occasions. Furthermore, 804 may be performed by a PDCCHtransmission component 1142.

In one aspect, the base station may transmit, to the UE PDCCH candidateswithin one of the plurality of active CORESETs based on a monitoringoccasion of the one or more monitoring occasions. That is, the basestation may transmit the PDCCH candidates within a first CORESET of theplurality of active CORESETs based on a first monitoring occasion, andmonitor for the PDCCH candidates within a second CORESET of theplurality of active CORESETs based on a second monitoring occasion, thesecond monitoring occasion being non-concurrent with the firstmonitoring occasion. The plurality of active CORESETs may be associatedwith a plurality of different BWPs, or the plurality of active CORESETsmay be associated with a plurality of different CCs.

In some aspects, the base station may transmit PDCCH candidates withinthe plurality of active CORESETs. In one aspect, the base station maytransmit a first subset of the PDCCH candidates within a first CORESETof the plurality of active CORESETs in a monitoring occasion, andmonitor for a second subset of the PDCCH candidates within a secondCORESET of the plurality of active CORESETs in the monitoring occasion.The first subset of the PDCCH candidates monitored within the firstCORESET and the second subset of the PDCCH candidates monitored withinthe second CORESET may be based on a monitoring occasion.

In another aspect, the base station may transmit a third subset of thePDCCH candidates within a first CORESET and a second CORESET of theplurality of active CORESETs, a first component of each PDCCH candidateof the third subset of the PDCCH candidates being within the firstCORESET, a second component of each PDCCH candidate of the third subsetof the PDCCH candidates being within the second CORESET. The firstcomponent and the second component may be based on a monitoringoccasion. At least one of the first component may itself be a PDCCHcandidate within the first subset of the PDCCH candidates, or the secondcomponent may itself be a PDCCH candidate within the second subset ofthe PDCCH candidates.

FIG. 9 is a flowchart 900 of a method of wireless communication. Themethod may be performed by a base station (e.g., the base station102/180/504; the apparatus 1102). The base station may configure asearch space with a first CORESET and a second CORESET, and the PDCCHmay be transmitted within the configured search space, where at leastone PDCCH candidate may include components associated with differentCORESETs on different monitoring occasions.

At 902, the base station may transmit a search space configuration for asearch space, the search space configuration configuring the searchspace to be associated with a plurality of active CORESET. For example,at 506, base station 504 may transmit a search space configuration for asearch space, the search space configuration configuring the searchspace to be associated with a plurality of active CORESET. Furthermore,902 may be performed by a search space configuration component 1140.

At 904, the base station may transmit the PDCCH within the configuredsearch space during one or more monitoring occasions, where at least onePDCCH candidate includes components associated with different CORESETson different monitoring occasions. For example, at 508, the base station504 may transmit the PDCCH within the configured search space during oneor more monitoring occasions, where at least one PDCCH candidateincludes components associated with different CORESETs on differentmonitoring occasions. Furthermore, 904 may be performed by a PDCCHtransmission component 1142.

In one aspect, the base station may transmit, to the UE PDCCH candidateswithin one of the plurality of active CORESETs based on a monitoringoccasion of the one or more monitoring occasions. That is, the basestation may transmit the PDCCH candidates within a first CORESET of theplurality of active CORESETs based on a first monitoring occasion, andmonitor for the PDCCH candidates within a second CORESET of theplurality of active CORESETs based on a second monitoring occasion, thesecond monitoring occasion being non-concurrent with the firstmonitoring occasion. The plurality of active CORESETs may be associatedwith a plurality of different BWPs, or the plurality of active CORESETsmay be associated with a plurality of different CCs.

In some aspects, the base station may transmit PDCCH candidates withinthe plurality of active CORESETs. In one aspect, the base station maytransmit a first subset of the PDCCH candidates within a first CORESETof the plurality of active CORESETs in a monitoring occasion, andmonitor for a second subset of the PDCCH candidates within a secondCORESET of the plurality of active CORESETs in the monitoring occasion.The first subset of the PDCCH candidates monitored within the firstCORESET and the second subset of the PDCCH candidates monitored withinthe second CORESET may be based on a monitoring occasion.

In another aspect, the base station may transmit a third subset of thePDCCH candidates within a first CORESET and a second CORESET of theplurality of active CORESETs, a first component of each PDCCH candidateof the third subset of the PDCCH candidates being within the firstCORESET, a second component of each PDCCH candidate of the third subsetof the PDCCH candidates being within the second CORESET. The firstcomponent and the second component may be based on a monitoringoccasion. At least one of the first component may itself be a PDCCHcandidate within the first subset of the PDCCH candidates, or the secondcomponent may itself be a PDCCH candidate within the second subset ofthe PDCCH candidates.

FIG. 10 is a diagram 1000 illustrating an example of a hardwareimplementation for an apparatus 1002. The apparatus 1002 may be a UE, acomponent of a UE, or may implement UE functionality. In some aspects,the apparatus 802 may include a cellular baseband processor 1004 (alsoreferred to as a modem) coupled to a cellular RF transceiver 1022. Insome aspects, the apparatus 1002 may further include one or moresubscriber identity modules (SIM) cards 1020, an application processor1006 coupled to a secure digital (SD) card 1008 and a screen 1010, aBluetooth module 1012, a wireless local area network (WLAN) module 1014,a Global Positioning System (GPS) module 1016, or a power supply 1018.The cellular baseband processor 1004 communicates through the cellularRF transceiver 1022 with the UE 104 and/or BS 102/180. The cellularbaseband processor 1004 may include a computer-readable medium/memory.The computer-readable medium/memory may be non-transitory. The cellularbaseband processor 1004 is responsible for general processing, includingthe execution of software stored on the computer-readable medium/memory.The software, when executed by the cellular baseband processor 1004,causes the cellular baseband processor 1004 to perform the variousfunctions described supra. The computer-readable medium/memory may alsobe used for storing data that is manipulated by the cellular basebandprocessor 1004 when executing software. The cellular baseband processor1004 further includes a reception component 1030, a communicationmanager 1032, and a transmission component 1034. The communicationmanager 1032 includes the one or more illustrated components. Thecomponents within the communication manager 1032 may be stored in thecomputer-readable medium/memory and/or configured as hardware within thecellular baseband processor 1004. The cellular baseband processor 1004may be a component of the UE 350 and may include the memory 360 and/orat least one of the TX processor 368, the RX processor 356, and thecontroller/processor 359. In one configuration, the apparatus 1002 maybe a modem chip and include just the baseband processor 1004, and inanother configuration, the apparatus 1002 may be the entire UE (e.g.,see 350 of FIG. 3) and include the additional modules of the apparatus1002.

The communication manager 1032 includes a search space configurationcomponent 1040 that is configured to receive a search spaceconfiguration for a search space, the search space configurationconfiguring the search space to be associated with a plurality of activeCORESETs, and receive a configuration indicating the AL threshold, e.g.,as described in connection with 602, 603, and 702. The communicationmanager 1032 further includes a PDCCH monitoring component 1042 that isconfigured to monitor for a PDCCH within the configured search spaceduring one or more monitoring occasions, where at least one PDCCHcandidate includes components associated with different CORESETs ondifferent monitoring occasions, e.g., as described in connection with604 and 804.

The apparatus may include additional components that perform each of theblocks of the algorithm in the flowcharts of FIGS. 5, 6, and 7. As such,each block in the flowcharts of FIGS. 5, 6, and 7 may be performed by acomponent and the apparatus may include one or more of those components.The components may be one or more hardware components specificallyconfigured to carry out the stated processes/algorithm, implemented by aprocessor configured to perform the stated processes/algorithm, storedwithin a computer-readable medium for implementation by a processor, orsome combination thereof.

As shown, the apparatus 1002 may include a variety of componentsconfigured for various functions. In one configuration, the apparatus1002, and in particular the cellular baseband processor 1004, includesmeans for receiving a search space configuration for a search space, thesearch space configuration configuring the search space to be associatedwith a plurality of active CORESETs, and means for monitoring for aPDCCH within the configured search space during one or more monitoringoccasions, where at least one PDCCH candidate includes componentsassociated with different CORESETs on different monitoring occasions.The apparatus 1002 includes means for monitoring for PDCCH candidateswithin one of the plurality of active CORESETs based on a monitoringoccasion of the one or more monitoring occasions, means for monitoringfor the PDCCH candidates within a first CORESET of the plurality ofactive CORESETs based on a first monitoring occasion, and means formonitoring for the PDCCH candidates within a second CORESET of theplurality of active CORESETs based on a second monitoring occasion, thesecond monitoring occasion being non-concurrent with the firstmonitoring occasion. The apparatus 1002 includes means for monitoringfor PDCCH candidates within the plurality of active CORESETs, means formonitoring for a first subset of the PDCCH candidates within a firstCORESET of the plurality of active CORESETs in a monitoring occasion,and means for monitoring for a second subset of the PDCCH candidateswithin a second CORESET of the plurality of active CORESETs in themonitoring occasion. The apparatus 1002 includes means for monitoringfor a third subset of the PDCCH candidates within a first CORESET and asecond CORESET of the plurality of active CORESETs, a first component ofeach PDCCH candidate of the third subset of the PDCCH candidates beingwithin the first CORESET, a second component of each PDCCH candidate ofthe third subset of the PDCCH candidates being within the secondCORESET. The apparatus 1002 includes means for receiving a configurationindicating the AL threshold. The means may be one or more of thecomponents of the apparatus 1002 configured to perform the functionsrecited by the means. As described supra, the apparatus 1002 may includethe TX Processor 368, the RX Processor 356, and the controller/processor359. As such, in one configuration, the means may be the TX Processor368, the RX Processor 356, and the controller/processor 359 configuredto perform the functions recited by the means.

FIG. 11 is a diagram 1100 illustrating an example of a hardwareimplementation for an apparatus 1102. The apparatus 1102 may be a basestation, a component of a base station, or may implement base stationfunctionality. In some aspects, the apparatus 802 may include a basebandunit 1104. The baseband unit 1104 may communicate through a cellular RFtransceiver 1122 with the UE 104. The baseband unit 1104 may include acomputer-readable medium/memory. The baseband unit 1104 is responsiblefor general processing, including the execution of software stored onthe computer-readable medium/memory. The software, when executed by thebaseband unit 1104, causes the baseband unit 1104 to perform the variousfunctions described supra. The computer-readable medium/memory may alsobe used for storing data that is manipulated by the baseband unit 1104when executing software. The baseband unit 1104 further includes areception component 1130, a communication manager 1132, and atransmission component 1134. The communication manager 1132 includes theone or more illustrated components. The components within thecommunication manager 1132 may be stored in the computer-readablemedium/memory and/or configured as hardware within the baseband unit1104. The baseband unit 1104 may be a component of the base station 310and may include the memory 376 and/or at least one of the TX processor316, the RX processor 370, and the controller/processor 375.

The communication manager 1132 includes a search space configurationcomponent 1140 that is configured to transmit a search spaceconfiguration for a search space, the search space configurationconfiguring the search space to be associated with a plurality of activeCORESET, and transmit a configuration indicating an AL threshold, e.g.,as described in connection with 802, 803, and 902. The communicationmanager 1132 further includes a PDCCH transmission component 1142 thatis configured to transmit the PDCCH within the configured search spaceduring one or more monitoring occasions, where at least one PDCCHcandidate includes components associated with different CORESETs ondifferent monitoring occasions, e.g., as described in connection with804 and 904.

The apparatus may include additional components that perform each of theblocks of the algorithm in the flowcharts of FIGS. 5, 8, and 9. As such,each block in the flowcharts of FIGS. 5, 8, and 9 may be performed by acomponent and the apparatus may include one or more of those components.The components may be one or more hardware components specificallyconfigured to carry out the stated processes/algorithm, implemented by aprocessor configured to perform the stated processes/algorithm, storedwithin a computer-readable medium for implementation by a processor, orsome combination thereof.

As shown, the apparatus 1102 may include a variety of componentsconfigured for various functions. In one configuration, the apparatus1102, and in particular the baseband unit 1104, includes means fortransmitting a search space configuration for a search space, the searchspace configuration configuring the search space to be associated with aplurality of active CORESET, and means for transmitting a PDCCH withinthe configured search space during one or more monitoring occasions,where at least one PDCCH candidate includes components associated withdifferent CORESETs on different monitoring occasions. The apparatus 1102includes means for transmitting PDCCH candidates within one of theplurality of active CORESETs based on a monitoring occasion of the oneor more monitoring occasions, means for transmitting the PDCCHcandidates within a first CORESET of the plurality of active CORESETsbased on a first monitoring occasion, and means for transmitting thePDCCH candidates within a second CORESET of the plurality of activeCORESETs based on a second monitoring occasion, the second monitoringoccasion being non-concurrent with the first monitoring occasion. Theapparatus 1102 includes means for transmitting PDCCH candidates withinthe plurality of active CORESETs, means for transmitting a first subsetof the PDCCH candidates within a first CORESET of the plurality ofactive CORESETs in a monitoring occasion, and means for transmitting asecond subset of the PDCCH candidates within a second CORESET of theplurality of active CORESETs in the monitoring occasion. The apparatus1102 includes means for transmitting a third subset of the PDCCHcandidates within a first CORESET and a second CORESET of the pluralityof active CORESETs, a first component of each PDCCH candidate of thethird subset of the PDCCH candidates being within the first CORESET, asecond component of each PDCCH candidate of the third subset of thePDCCH candidates being within the second CORESET. The apparatus 1102includes means for transmitting a configuration indicating the ALthreshold. The means may be one or more of the components of theapparatus 1102 configured to perform the functions recited by the means.As described supra, the apparatus 1102 may include the TX Processor 316,the RX Processor 370, and the controller/processor 375. As such, in oneconfiguration, the means may be the TX Processor 316, the RX Processor370, and the controller/processor 375 configured to perform thefunctions recited by the means.

The apparatus of wireless communication may include a UE and/or a basestation. The base station may transmit a search space configuration fora search space to the UE, the search space configuration configuring thesearch space to be associated with a first CORESET and a second CORESET,and transmit a PDCCH within the configured search space. The UE mayreceive the search space configuration for the search space. The UE mayalso monitor for the PDCCH based on the search space configurationreceived from the base station. In one aspect, at least one PDCCHcandidate may include components associated with different CORESETs ondifferent monitoring occasions. The PDCCH candidate may include a firstsubset within the first CORESET and a second subset within the secondCORESET. The first or second component may be itself a PDCCH candidatewithin the first or second subset of the PDCCH candidates. The PDCCHcandidates may have an aggregation level greater than a threshold value,which may be configured explicitly through one of a DCI or a MAC-CE, orimplicitly based on another dynamic signaling.

It is understood that the specific order or hierarchy of blocks in theprocesses/flowcharts disclosed is an illustration of example approaches.Based upon design preferences, it is understood that the specific orderor hierarchy of blocks in the processes/flowcharts may be rearranged.Further, some blocks may be combined or omitted. The accompanying methodclaims present elements of the various blocks in a sample order, and arenot meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Terms such as “if,” “when,” and“while” should be interpreted to mean “under the condition that” ratherthan imply an immediate temporal relationship or reaction. That is,these phrases, e.g., “when,” do not imply an immediate action inresponse to or during the occurrence of an action, but simply imply thatif a condition is met then an action will occur, but without requiring aspecific or immediate time constraint for the action to occur. The word“exemplary” is used herein to mean “serving as an example, instance, orillustration.” Any aspect described herein as “exemplary” is notnecessarily to be construed as preferred or advantageous over otheraspects. Unless specifically stated otherwise, the term “some” refers toone or more. Combinations such as “at least one of A, B, or C,” “one ormore of A, B, or C,” “at least one of A, B, and C,” “one or more of A,B, and C,” and “A, B, C, or any combination thereof” include anycombination of A, B, and/or C, and may include multiples of A, multiplesof B, or multiples of C. Specifically, combinations such as “at leastone of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B,and C,” “one or more of A, B, and C,” and “A, B, C, or any combinationthereof” may be A only, B only, C only, A and B, A and C, B and C, or Aand B and C, where any such combinations may contain one or more memberor members of A, B, or C. All structural and functional equivalents tothe elements of the various aspects described throughout this disclosurethat are known or later come to be known to those of ordinary skill inthe art are expressly incorporated herein by reference and are intendedto be encompassed by the claims. Moreover, nothing disclosed herein isintended to be dedicated to the public regardless of whether suchdisclosure is explicitly recited in the claims. The words “module,”“mechanism,” “element,” “device,” and the like may not be a substitutefor the word “means.” As such, no claim element is to be construed as ameans plus function unless the element is expressly recited using thephrase “means for.”

The following aspects are illustrative only and may be combined withother aspects or teachings described herein, without limitation.

Aspect 1 is an apparatus for wireless communication including at leastone processor coupled to a memory and configured to receive a searchspace configuration for a search space, the search space configurationconfiguring the search space to be associated with a plurality of activeCORESETs, and monitor for a PDCCH within the configured search spaceduring one or more monitoring occasions, where at least one PDCCHcandidate includes components associated with different CORESETs ondifferent monitoring occasions.

Aspect 2 is the apparatus of aspect 1, where, to monitor the PDCCHwithin the configured search space, the at least one processor and thememory are configured to monitor for PDCCH candidates within one of theplurality of active CORESETs based on a monitoring occasion of the oneor more monitoring occasions.

Aspect 3 is the apparatus of aspects 1 and 2, where, to monitor forPDCCH candidates within one of the plurality of active CORESETs, the atleast one processor and the memory are configured to monitor for thePDCCH candidates within a first CORESET of the plurality of activeCORESETs based on a first monitoring occasion, and monitor for the PDCCHcandidates within a second CORESET of the plurality of active CORESETsbased on a second monitoring occasion, the second monitoring occasionbeing non-concurrent with the first monitoring occasion.

Aspect 4 is the apparatus of any of aspects 1 to 3, where, to monitorthe PDCCH within the configured search space, the at least one processorand the memory are configured to monitor for PDCCH candidates within theplurality of active CORESETs.

Aspect 5 is the apparatus of aspect 4, where, to monitor the PDCCHwithin the configured search space, the at least one processor and thememory are further configured to monitor for a first subset of the PDCCHcandidates within the first CORESET of the plurality of active CORESETsin a monitoring occasion, and monitor for the second subset of the PDCCHcandidates within a second CORESET of the plurality of active CORESETsin the monitoring occasion.

Aspect 6 is the apparatus of aspect 5, where the first subset of thePDCCH candidates monitored within the first CORESET and the secondsubset of the PDCCH candidates monitored within the second CORESET arebased on the monitoring occasion.

Aspect 7 is the apparatus of aspect 5, where, to monitor the PDCCHwithin the configured search space, the at least one processor and thememory are further configured to monitor for a third subset of the PDCCHcandidates within the first CORESET and the second CORESET of theplurality of active CORESETs, a first component of each PDCCH candidateof the third subset of the PDCCH candidates being within the firstCORESET, a second component of each PDCCH candidate of the third subsetof the PDCCH candidates being within the second CORESET.

Aspect 8 is the apparatus of aspect 7, where the first component and thesecond component are based on the monitoring occasion.

Aspect 9 is the apparatus of any of aspects 7 and 8, where at least oneof the first component is itself a PDCCH candidate within the firstsubset of the PDCCH candidates, or the second component is itself aPDCCH candidate within the second subset of the PDCCH candidates.

Aspect 10 is the apparatus of any of aspects 7 to 9, where PDCCHcandidates in the third subset of the PDCCH candidates each have an ALgreater than an AL threshold.

Aspect 11 is the apparatus of aspect 10, where the AL threshold is 16,and the PDCCH candidates in the first subset of the PDCCH candidateseach have the AL equal to 2^(n), where n≥5.

Aspect 12 is the apparatus of any of aspects 10 and 11, where the atleast one processor and the memory are further configured to receive aconfiguration indicating the AL threshold.

Aspect 13 is the apparatus of aspect 12, where the configuration isreceived explicitly through one of DCI or a MAC-CE.

Aspect 14 is the apparatus of any of aspects 12 and 13, where theconfiguration is received implicitly based on other signaling within oneof DCI or a MAC-CE.

Aspect 15 is the apparatus of any of aspects 1 to 14, further comprisinga transceiver coupled to the at least one processor, where the pluralityof active CORESETs is associated with a plurality of different BWPs.

Aspect 16 is the apparatus of any of aspects 1 to 15, where theplurality of active CORESETs is associated with a plurality of differentCCs.

Aspect 17 is a method of wireless communication for implementing any ofaspects 1 to 16.

Aspect 18 is an apparatus for wireless communication including means forimplementing any of aspects 1 to 16.

Aspect 19 is a computer-readable medium storing computer executablecode, where the code when executed by a processor causes the processorto implement any of aspects 1 to 16.

Aspect 20 is an apparatus for wireless communication including at leastone processor coupled to a memory and configured to transmit a searchspace configuration for a search space, the search space configurationconfiguring the search space to be associated with a plurality of activeCORESET, and transmit a PDCCH within the configured search space duringone or more monitoring occasions, where at least one PDCCH candidateincludes components associated with different CORESETs on differentmonitoring occasions.

Aspect 21 is the apparatus of aspect 20, where, to transmit the PDCCHwithin the configured search space, the at least one processor and thememory are configured to transmit PDCCH candidates within one of theplurality of active CORESETs based on the monitoring occasion of the oneor more monitoring occasions.

Aspect 22 is the apparatus of aspects 20 and 21, where, to transmit thePDCCH candidates within one of the plurality of active CORESETs, the atleast one processor and the memory are configured to transmit the PDCCHcandidates within a first CORESET of the plurality of active CORESETsbased on a first monitoring occasion, and transmit the PDCCH candidateswithin a second CORESET of the plurality of active CORESETs based on asecond monitoring occasion, the second monitoring occasion beingnon-concurrent with the first monitoring occasion.

Aspect 23 is the apparatus of any of aspects 20 to 22, where, totransmit the PDCCH within the configured search space, the at least oneprocessor and the memory are configured to transmit PDCCH candidateswithin the plurality of active CORESETs.

Aspect 24 is the apparatus of any of aspects 20 to 23, where, totransmit the PDCCH within the configured search space, the at least oneprocessor and the memory are further configured to transmit a firstsubset of the PDCCH candidates within a first CORESET of the pluralityof active CORESETs in a monitoring occasion, and transmit a secondsubset of the PDCCH candidates within a second CORESET of the pluralityof active CORESETs in the monitoring occasion.

Aspect 25 is the apparatus of aspect 24, where the first subset of thePDCCH candidates monitored within the first CORESET and the secondsubset of the PDCCH candidates monitored within the second CORESET arebased on the monitoring occasion.

Aspect 26 is the apparatus of aspect 24, where, to transmit PDCCH withinthe configured search space, the at least one processor and the memoryare further configured to transmit a third subset of the PDCCHcandidates within a first CORESET and a second CORESET of the pluralityof active CORESETs, a first component of each PDCCH candidate of thethird subset of the PDCCH candidates being within the first CORESET, asecond component of each PDCCH candidate of the third subset of thePDCCH candidates being within the second CORESET.

Aspect 27 is the apparatus of aspect 26, where the first component andthe second component are based on the monitoring occasion.

Aspect 28 is the apparatus of any of aspects 26 and 27, where at leastone of the first component is itself a PDCCH candidate within the firstsubset of the PDCCH candidates, or the second component is itself aPDCCH candidate within the second subset of the PDCCH candidates.

Aspect 29 is the apparatus of any of aspects 26 to 28, where PDCCHcandidates in the third subset of the PDCCH candidates each have an ALgreater than an AL threshold.

Aspect 30 is the apparatus of aspect 29, where the AL threshold is 16,and the PDCCH candidates in the first subset of the PDCCH candidateseach have an AL equal to 2^(n), where n≥5.

Aspect 31 is the apparatus of any of aspects 29 to 30, where the atleast one processor and the memory are further configured to transmit aconfiguration indicating the AL threshold.

Aspect 32 is the apparatus of aspect 31, where the configuration istransmitted explicitly through one of DCI or a MAC-CE.

Aspect 33 is the apparatus of any of aspects 31 to 32, where theconfiguration is transmitted implicitly based on other signaling withinone of DCI or a MAC-CE.

Aspect 34 is the apparatus of any of aspects 20 to 33, furthercomprising a transceiver coupled to the at least one processor, wherethe plurality of active CORESETs is associated with a plurality ofdifferent BWPs.

Aspect 35 is the apparatus of any of aspects 20 to 34, where theplurality of active CORESETs is associated with a plurality of differentCCs.

Aspect 36 is a method of wireless communication for implementing any ofaspects 20 to 35.

Aspect 37 is an apparatus for wireless communication including means forimplementing any of aspects 20 to 35.

Aspect 38 is a computer-readable medium storing computer executablecode, where the code when executed by a processor causes the processorto implement any of aspects 20 to 35.

What is claimed is:
 1. An apparatus for wireless communication at a userequipment (UE), comprising: a memory; and at least one processor coupledto the memory, the at least one processor and the memory configured to:receive a search space configuration for a search space, the searchspace configuration configuring the search space to be associated with aplurality of active control resource sets (CORESETs); and monitor for aphysical downlink control channel (PDCCH) within the configured searchspace during one or more monitoring occasions, at least one PDCCHcandidate comprising components associated with different CORESETs ondifferent monitoring occasions.
 2. The apparatus of claim 1, wherein, tomonitor the PDCCH within the configured search space, the at least oneprocessor and the memory are configured to: monitor for PDCCH candidateswithin a first CORESET of the plurality of active CORESETs based on afirst monitoring occasion; and monitor for the PDCCH candidates within asecond CORESET of the plurality of active CORESETs based on a secondmonitoring occasion, the second monitoring occasion being non-concurrentwith the first monitoring occasion.
 3. The apparatus of claim 1,wherein, to monitor the PDCCH within the configured search space, the atleast one processor and the memory are configured to: monitor for afirst subset of PDCCH candidates within a first CORESET of the pluralityof active CORESETs in a monitoring occasion; and monitor for a secondsubset of the PDCCH candidates within a second CORESET of the pluralityof active CORESETs in the monitoring occasion.
 4. The apparatus of claim3, wherein the first subset of the PDCCH candidates monitored within thefirst CORESET and the second subset of the PDCCH candidates monitoredwithin the second CORESET are based on the monitoring occasion.
 5. Theapparatus of claim 3, wherein, to monitor the PDCCH within theconfigured search space, the at least one processor and the memory arefurther configured to: monitor for a third subset of the PDCCHcandidates within the first CORESET and the second CORESET of theplurality of active CORESETs, a first component of each PDCCH candidateof the third subset of the PDCCH candidates being within the firstCORESET, a second component of each PDCCH candidate of the third subsetof the PDCCH candidates being within the second CORESET.
 6. Theapparatus of claim 5, wherein the first component and the secondcomponent are based on the monitoring occasion.
 7. The apparatus ofclaim 5, wherein at least one of the first component is itself a PDCCHcandidate within the first subset of the PDCCH candidates, or the secondcomponent is itself a PDCCH candidate within the second subset of thePDCCH candidates.
 8. The apparatus of claim 5, wherein PDCCH candidatesin the third subset of the PDCCH candidates each have an aggregationlevel (AL) greater than an AL threshold.
 9. The apparatus of claim 8,wherein the AL threshold is 16, and the PDCCH candidates in the firstsubset of the PDCCH candidates each have the AL equal to 2^(n), wheren≥5.
 10. The apparatus of claim 8, where the at least one processor andthe memory are further configured to receive a configuration indicatingthe AL threshold.
 11. The apparatus of claim 10, wherein theconfiguration is received, through a dedicated signal in at least one ofdownlink control information (DCI) or a media access control (MAC)control element (CE) (MAC-CE), or based on other signal within at leastone of the DCI or the MAC-CE.
 12. The apparatus of claim 1, furthercomprising a transceiver coupled to the at least one processor, whereinthe plurality of active CORESETs is associated with a plurality ofdifferent bandwidth parts (BWPs) or a plurality of different componentcarriers (CCs).
 13. A method of wireless communication at a userequipment (UE), comprising: receiving a search space configuration for asearch space, the search space configuration configuring the searchspace to be associated with a plurality of active control resource sets(CORESETs); and monitoring for a physical downlink control channel(PDCCH) within the configured search space during one or more monitoringoccasions, at least one PDCCH candidate comprising components associatedwith different CORESETs on different monitoring occasions.
 14. Themethod of claim 13, further comprising: monitoring for PDCCH candidateswithin a first CORESET of the plurality of active CORESETs based on afirst monitoring occasion; and monitoring for the PDCCH candidateswithin a second CORESET of the plurality of active CORESETs based on asecond monitoring occasion, the second monitoring occasion beingnon-concurrent with the first monitoring occasion.
 15. The method ofclaim 13, further comprising: monitoring for a first subset of PDCCHcandidates within a first CORESET of the plurality of active CORESETs ina monitoring occasion; and monitoring for a second subset of the PDCCHcandidates within a second CORESET of the plurality of active CORESETsin the monitoring occasion.
 16. An apparatus for wireless communicationat a base station, comprising: a memory; and at least one processorcoupled to the memory and configured to: transmit a search spaceconfiguration for a search space, the search space configurationconfiguring the search space to be associated with a plurality of activecontrol resource sets (CORESETs); and transmit a physical downlinkcontrol channel (PDCCH) within the configured search space during one ormore monitoring occasions, at least one PDCCH candidate comprisingcomponents associated with different CORESETs on different monitoringoccasions.
 17. The apparatus of claim 16, wherein, to transmit the PDCCHwithin the configured search space, the at least one processor and thememory are configured to: transmit PDCCH candidates within a firstCORESET of the plurality of active CORESETs based on a first monitoringoccasion; and transmit the PDCCH candidates within a second CORESET ofthe plurality of active CORESETs based on a second monitoring occasion,the second monitoring occasion being non-concurrent with the firstmonitoring occasion.
 18. The apparatus of claim 16, wherein, to transmitthe PDCCH within the configured search space, the at least one processorand the memory are configured to: transmit a first subset of PDCCHcandidates within a first CORESET of the plurality of active CORESETs ina monitoring occasion; and transmit a second subset of the PDCCHcandidates within a second CORESET of the plurality of active CORESETsin the monitoring occasion.
 19. The apparatus of claim 18, wherein thefirst subset of the PDCCH candidates within the first CORESET and thesecond subset of the PDCCH candidates within the second CORESET arebased on the monitoring occasion.
 20. The apparatus of claim 18,wherein, to transmit the PDCCH within the configured search space, theat least one processor and the memory are further configured to:transmitting a third subset of the PDCCH candidates within the firstCORESET and the second CORESET of the plurality of active CORESETs, afirst component of each PDCCH candidate of the third subset of the PDCCHcandidates being within the first CORESET, a second component of eachPDCCH candidate of the third subset of the PDCCH candidates being withinthe second CORESET.
 21. The apparatus of claim 20, wherein the firstcomponent and the second component are based on the monitoring occasion.22. The apparatus of claim 20, wherein at least one of the firstcomponent is itself a PDCCH candidate within the first subset of thePDCCH candidates, or the second component is itself a PDCCH candidatewithin the second subset of the PDCCH candidates.
 23. The apparatus ofclaim 20, wherein PDCCH candidates in the third subset of the PDCCHcandidates each have an aggregation level (AL) greater than an ALthreshold.
 24. The apparatus of claim 23, wherein the AL threshold is16, and the PDCCH candidates in the first subset of the PDCCH candidateseach have the AL equal to 2^(n), where n≥5.
 25. The apparatus of claim23, wherein the at least one processor is further configured to transmita configuration indicating the AL threshold.
 26. The apparatus of claim25, wherein the configuration is transmitted, through a dedicated signalin at least one of downlink control information (DCI) or a media accesscontrol (MAC) control element (CE) (MAC-CE), or based on other signalwithin at least one of the DCI or the MAC-CE.
 27. The apparatus of claim16, further comprising a transceiver coupled to the at least oneprocessor, wherein the plurality of active CORESETs is associated with aplurality of different bandwidth parts (BWPs) or different componentcarriers (CCs).
 28. A method of wireless communication at a basestation, comprising: transmitting a search space configuration for asearch space, the search space configuration configuring the searchspace to be associated with a plurality of active control resource sets(CORESETs); and transmitting a physical downlink control channel (PDCCH)within the configured search space during one or more monitoringoccasions, at least one PDCCH candidate comprising components associatedwith different CORESETs on different monitoring occasions.
 29. Themethod of claim 28, further comprising: transmitting PDCCH candidateswithin a first CORESET of the plurality of active CORESETs based on afirst monitoring occasion; and transmitting the PDCCH candidates withina second CORESET of the plurality of active CORESETs based on a secondmonitoring occasion, the second monitoring occasion being non-concurrentwith the first monitoring occasion.
 30. The method of claim 28, furthercomprising: transmitting a first subset of PDCCH candidates within afirst CORESET of the plurality of active CORESETs in a monitoringoccasion; and transmitting a second subset of the PDCCH candidateswithin a second CORESET of the plurality of active CORESETs in themonitoring occasion.